Tipo de flange	Capacidade de pressão	Uso Comum
Pescoço de solda	Alto	De alta pressão, high-temp pipelines
Deslizamento	Moderado	General low-pressure systems
Solda de soquete	Alto (small bore)	Small-diameter high-pressure lines
Cego	Muito alto	System termination points
Junta sobreposta	Baixo a moderado	Non-critical, dismantling needed
Rosqueado	Baixo	Baixa pressão, no-weld applications

For high-pressure systems, weld neck or socket weld flanges are typically selected.

sasa oblonga offers all standard flange types, machined and tested to meet pressure design conditions.

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5. Gasket Type and Bolt Load

The flange’s desempenho de vedação is also influenced by the type of gasket used and the bolt load that the flange can handle. High-pressure classes generally require:

• Juntas metálicas (ferida em espiral, RTJ)

• Higher bolt torque

• Greater flange thickness and strength

Ensure that the gasket material and geometry are compatible with the flange face finish and pressure class.

Common flange faces include:

• Rosto levantado (RF)

• Junta tipo anel (RTJ)

• Rosto plano (FF)

sasa oblonga provides matching gasket sets and bolting specifications for their pressure-rated flange assemblies.

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6. Pipeline Media and Corrosion Conditions

O nature of the fluid or gas transported also impacts flange selection. Corrosive or aggressive media (such as acids, água salgada, high-pressure steam, ou hidrocarbonetos) can degrade flange material, reducing its pressure resistance over time.

Considerar:

• Stainless steel or nickel alloy flanges for aggressive fluids

• Corrosion allowances and lining options for carbon steel flanges

• NACE MR0175 conformidade for sour service in oil & gás

sasa oblonga provides material compatibility recommendations based on specific pipeline fluids and service conditions.

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7. Condições Ambientais

Beyond internal conditions, o ambiente externo can also influence the longevity and pressure performance of the flange:

• Plataformas offshore require high-grade stainless or duplex flanges

• Outdoor exposure demands UV and corrosion-resistant coatings

• Cryogenic environments need low-temperature impact-tested flanges (A350LF2)

Temperature differentials, salt exposure, and humidity can cause flange degradation if not considered in material and pressure class selection.

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8. System Design Codes and Regulatory Compliance

Flanges must comply with project-specific and regional codes:

• ASME B31.3 para tubulação de processo

• Seção VIII da ASME for pressure vessels

• EN 13480 for European industrial piping

• DEP, NORUEGA, API, e padrões ISO for regional or industry-specific compliance

These codes define:

• Allowable stress values

• Flange design verification

• Pressure test protocols

• Inspection and documentation requirements

sasa oblonga supplies pressure-rated flanges with full documentation packages, including EN10204 3.1/3.2, PMI, UT, and pressure test reports.

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9. Future Expansion or Modification

When designing a pipeline, considerar future changes in system pressure, flow rate, ou temperatura. If the system may undergo upgrades, it’s safer to choose a higher pressure class flange from the outset.

A slightly higher upfront cost can prevent expensive rework or system downtime later.

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10. Disponibilidade e prazo de entrega

Some pressure classes or material combinations may have longer lead times ou limited availability. For urgent projects, choosing a more readily available pressure class can ensure timely delivery.

sasa oblonga maintains a large stock of Class 150 para 900 and PN10 to PN64 flanges in common sizes and materials for rapid dispatch.

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Conclusão

Selecting the right pressure rating for a connecting flange requires a comprehensive understanding of system pressure, temperatura, mídia, material properties, and applicable standards. Overlooking even one factor can lead to system failure, riscos de segurança, or compliance issues.

Em caso de dúvida, always consult pressure-temperature rating tables, design engineers, or your flange supplier. A well-chosen flange ensures the long-term safety and efficiency do sistema de tubulação.

With certified manufacturing, expert engineering, and global supply capabilities, sasa oblonga is your trusted partner for selecting and supplying the correct pressure-rated flanges for any project.